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A four-year lidar-sun photometer aerosol study at São Paulo, Brazil

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dc.contributor.author Landulfo, E en
dc.contributor.author Papayannis, A en
dc.contributor.author Torres, AS en
dc.contributor.author Uehara, ST en
dc.contributor.author Pozzetti, LMV en
dc.contributor.author de Matos, CA en
dc.contributor.author Sawamura, P en
dc.contributor.author Nakaema, WM en
dc.contributor.author de Jesus, W en
dc.date.accessioned 2014-03-01T02:45:01Z
dc.date.available 2014-03-01T02:45:01Z
dc.date.issued 2008 en
dc.identifier.issn 0739-0572 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/32104
dc.subject.classification Engineering, Ocean en
dc.subject.classification Meteorology & Atmospheric Sciences en
dc.subject.other Aerosol backscattering en
dc.subject.other Aerosol optical thickness en
dc.subject.other Aerosol robotic networks en
dc.subject.other Backscatter coefficients en
dc.subject.other Cloud base en
dc.subject.other Cloud properties en
dc.subject.other Dry and wet en
dc.subject.other Extinction coefficients en
dc.subject.other Extinction-to-backscatter ratio en
dc.subject.other Input values en
dc.subject.other LIDAR data en
dc.subject.other Lidar ratio en
dc.subject.other Lidar systems en
dc.subject.other Lower troposphere en
dc.subject.other Phase functions en
dc.subject.other Planetary boundary layers en
dc.subject.other Single scattering albedo en
dc.subject.other Structure and dynamics en
dc.subject.other Suburban areas en
dc.subject.other Sun photometers en
dc.subject.other Sun-tracking en
dc.subject.other Temporal Database en
dc.subject.other Vertical profile en
dc.subject.other Visible spectral regions en
dc.subject.other Wet season en
dc.subject.other Acoustic emissions en
dc.subject.other Atmospheric aerosols en
dc.subject.other Atmospheric thermodynamics en
dc.subject.other Backscattering en
dc.subject.other Electric reactors en
dc.subject.other Image sensors en
dc.subject.other Oceanography en
dc.subject.other Optical radar en
dc.subject.other Photometers en
dc.subject.other Photometry en
dc.subject.other Sun en
dc.subject.other Atmospherics en
dc.subject.other absorption en
dc.subject.other aerosol en
dc.subject.other aerosol property en
dc.subject.other boundary layer en
dc.subject.other conference proceeding en
dc.subject.other database en
dc.subject.other lidar en
dc.subject.other measurement method en
dc.subject.other photometer en
dc.subject.other satellite data en
dc.subject.other troposphere en
dc.subject.other vertical profile en
dc.subject.other Brazil en
dc.subject.other Sao Paulo [Brazil] en
dc.subject.other South America en
dc.title A four-year lidar-sun photometer aerosol study at São Paulo, Brazil en
heal.type conferenceItem en
heal.identifier.primary 10.1175/2007JTECHA984.1 en
heal.identifier.secondary http://dx.doi.org/10.1175/2007JTECHA984.1 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract A backscattering lidar system, the first of this kind in Brazil, has been used to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4-6 km above sea level (ASL), in a suburban area in the city of São Paulo. The lidar system has been operational since September 2001. The lidar data products were obtained in a 4-yr period (2001-04) and concerned the aerosol optical thickness (AOT), the aerosol backscattering and extinction coefficients at 532 nm, cloud properties (cloud base, thickness), planetary boundary layer (PBL) heights, aerosol layering, and the structure and dynamics of the lower troposphere. The lidar data are presented and analyzed in synergy with AOT measurements obtained by a Cimel sun-tracking photometer in the visible spectral region, not only to validate the lidar data but also to provide an input value of the so-called extinction-to-backscatter ratio [lidar ratio (LR)]. A correlation between the lidar data and the data obtained by a Cimel sun-tracking photometer [belonging to the Aerosol Robotic Network (AERONET)] is being made to set a temporal database of those data that were collected concomitantly and to cross correlate the information gathered by each instrument. The sun photometer data are used to provide AOT values at selected wavelengths and thus to derive the Ångström exponent (AE) values, single scattering albedo (SSA) and phase function values, and LR values. The analysis of these data showed an important trend in the seasonal signature of the LR indicating a change of the predominant type of aerosol between the dry and wet seasons. Thus, during the wet season the LR lidar values are greater (50-60 sr), which indicates that larger absorption by the aerosols takes place during this period. The corresponding AE values range between 1.3 and 2 for both periods. © 2008 American Meteorological Society. en
heal.publisher AMER METEOROLOGICAL SOC en
heal.journalName Journal of Atmospheric and Oceanic Technology en
dc.identifier.doi 10.1175/2007JTECHA984.1 en
dc.identifier.isi ISI:000259153700017 en
dc.identifier.volume 25 en
dc.identifier.issue 8 en
dc.identifier.spage 1463 en
dc.identifier.epage 1468 en


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